KONG Toys for Dogs: Size Guide, Types, Fillings & Safety

Updated August 2026

Choosing a KONG looks simple until you discover the different sizes, colours and rubber types.

The quick answer is:

• Puppy KONG: softer rubber designed for puppies and their developing teeth
• Red KONG Classic: the standard choice for most adult dogs
• Black KONG Extreme: tougher rubber for powerful chewers
• Purple KONG Senior: softer rubber intended for ageing dogs

Size matters just as much as colour. Choose a KONG large enough that your dog cannot swallow it, and if you are between sizes or unsure, KONG advises sizing up. Powerful chewers may also need to go up a size or two. KONG’s official Classic guidance confirms its current size and safety recommendations.

I have used food toys as part of dog enrichment for many years. What I like about a KONG is that the same basic toy can be made extremely easy for a beginner or gradually made more challenging for a dog who already understands how it works.

The mistake is assuming harder is automatically better.

It isn’t.

A KONG should give your dog an enjoyable opportunity to lick, chew and work for food. It shouldn’t become a half-hour battle with frozen concrete.

Affiliate disclosure: This guide contains affiliate links. If you buy something through one of these links, I may earn a small commission at no extra cost to you. As an Amazon Associate, I earn from qualifying purchases. Prices and availability can change. I only recommend products I consider relevant to the advice on this page.

Which KONG should I choose?

For most dogs, this is the easiest starting point:

Your dog	KONG range	Colour	Best suited to
Puppy	KONG Puppy	Pink or blue	Developing puppy teeth and gums
Average adult chewer	KONG Classic	Red	Everyday chewing and food enrichment
Powerful chewer	KONG Extreme	Black	Dogs needing KONG’s toughest rubber formula
Older dog	KONG Senior	Purple	Ageing dogs who benefit from softer rubber

KONG describes the red Classic as its rubber for average adult chewers and the black Extreme as its toughest formula for power chewers. Puppy rubber is softer for developing teeth, while Senior is softer for ageing teeth and gums. KONG’s official guide to chewing styles explains the differences.

These are starting points, not substitutes for watching the dog in front of you.

An older dog with dental problems, for example, needs individual veterinary advice rather than simply being handed a purple toy because the packaging says Senior.

Likewise, a small dog can still be a determined chewer.

Choose based on age, mouth size, chewing style, and how your dog actually uses toys.

KONG size guide

This is one of the most important decisions.

KONG’s current Classic size guidance is:

KONG Classic size	Manufacturer’s current weight guidance
XS	Up to 5 lb / about 2.3 kg
S	Up to 20 lb / about 9 kg
M	15–35 lb / about 7–16 kg
L	30–65 lb / about 14–30 kg
XL	60–90 lb / about 27–41 kg
XXL	85+ lb / about 39+ kg

Source: KONG Classic official product information. (KONG Company)

Which KONG size should I buy for my dog’s breed?

I would not choose a KONG by breed alone.

Two dogs of the same breed can have different:

• body sizes
• mouth sizes
• ages
• chewing strength
• play styles

The manufacturer’s weight guide gives you a starting point, but the toy must also be appropriately sized for your individual dog’s mouth and chewing behaviour.

If you are uncertain about which size to choose, KONG advises choosing the larger size for safety.

That is much more useful than a rigid chart saying every Cocker Spaniel needs one size and every Labrador needs another.

Dogs have not read those charts.

What if my dog is a power chewer?

KONG advises that power chewers may need to increase one or two sizes and/or move to KONG Extreme.

That matters because choosing a tougher rubber does not remove the need to choose an appropriate size.

No dog toy is indestructible.

KONG itself explicitly rejects the idea that its toys are indestructible and recommends supervising new toys until you know how your dog uses them. KONG’s guidance on toy durability is worth reading if you have a determined chewer.

KONG Puppy: Which KONG is best for a puppy?

The Puppy KONG uses KONG’s softer puppy rubber and is designed around developing puppy teeth and gums.

KONG currently says its Puppy rubber toys are not recommended for puppies over nine months and advises moving to an appropriately sized Puppy KONG as the puppy grows, then graduating to Classic or another appropriate adult rubber.

KONG Puppy

AMAZON UK puppy kong
This link opens the stated size. Check the size guide above and use Amazon’s size selector before ordering.

I would introduce a puppy KONG very easily.

Put a few pieces of puppy food loosely inside so some almost fall out.

Let your puppy discover how it works.

Do not immediately tightly pack it, freeze it solid and then wonder why your eight-week-old puppy walks away.

KONG itself recommends loosely filling a Puppy KONG while the puppy is learning so they get an easy win.

For wider advice on settling in, routines, chewing and early learning, see my Bringing a Puppy Home guide.

Red KONG Classic: the best starting point for many adult dogs

The red Classic is KONG’s standard natural-rubber toy for average adult chewers.

It can be used for:

• loosely stuffed food enrichment
• licking and chewing
• part of a dog’s meal
• supervised play
• an unpredictable bounce during appropriate fetch games

Classic KONG

View the AMAZON UK KONG Classic
This link opens the stated size. Check the size guide above and use Amazon’s size selector before ordering.

If someone asks me which KONG to consider first for an ordinary healthy adult dog who is not an extreme chewer, this is generally the range I would look at.

But correct sizing still comes first.

Black KONG Extreme: for powerful chewers

The black KONG Extreme uses KONG’s toughest rubber formula and is intended for determined/powerful chewers.

Extreme KONG

View the AMAZON UK KONG Extreme
This link opens the stated size. Check the size guide above and use Amazon’s size selector before ordering.

Tougher does not mean indestructible.

Inspect it regularly.

If your dog removes pieces, creates significant splits or damages the toy, take it away.

And remember that a dog capable of destroying toys quickly may need a larger KONG as well as the tougher Extreme rubber.

Purple KONG Senior: for older dogs

KONG’s purple Senior rubber is softer than its standard adult formula and is intended to provide ageing dogs with a gentler chewing option.

Kong Senior Dog Toy

View the AMAZON UK KONG Senior

That does not mean every senior dog needs a Senior KONG.

Older dogs can develop:

• worn or painful teeth
• gum problems
• arthritis
• reduced neck mobility
• changes in appetite
• reduced strength
• cognitive changes

If your older dog suddenly stops using a toy they previously enjoyed, struggles to chew or seems uncomfortable, speak to your vet rather than simply changing toys.

For gentler activity ideas, see my Senior Dog Exercise and Enrichment guide.

What can I put in a KONG?

You don’t need complicated recipes.

For many dogs, useful fillings include part of their normal diet.

Depending on what your dog normally eats and tolerates, that might include:

• their normal kibble
• soaked kibble
• suitable wet dog food
• part of their normal complete food
• a small amount of dog-safe soft food
• a mixture of familiar foods

I prefer to start with familiar food rather than buy a cupboard full of special KONG fillings.

Start easy

For a dog who has never used one:

1. Put several loose pieces of familiar food inside.
2. Leave some near the large opening.
3. Allow food to fall out relatively easily.
4. Let your dog work out what happens.
5. Make it gradually more interesting only when they understand it.

The objective is not to keep your dog occupied for as long as possible.

The objective is enjoyable enrichment.

My Dog Enrichment Safety: When a Brain Game Becomes Frustrating guide explains what to watch for when food puzzles become too difficult.

Can I put peanut butter in a KONG?

You can use a small amount of dog-safe peanut butter if it is suitable for your individual dog, but check the ingredients carefully.

Most importantly, never give a dog a product containing xylitol, also increasingly labelled as birch sugar. It is toxic to dogs.

Peanut butter is also calorie-dense, so you do not need to fill an entire KONG with it.

A thin smear can be plenty.

If your dog has a medical condition, food allergy, pancreatitis history, needs a special diet or you are uncertain whether a food is appropriate, ask your vet.

Do I have to buy special KONG filling?

No.

This is one area where marketing can make enrichment seem more complicated than it needs to be.

You can often use part of the food your dog already eats.

That helps avoid unnecessary spending and makes it easier to account for calories.

My Ditch the Bowl at Mealtimes guide has more ideas for using part of a dog’s normal meals as enrichment.

Can you freeze a KONG?

Yes, suitable fillings can be frozen inside a KONG to make them last longer.

But I would not start a beginner with a densely packed frozen KONG.

Teach the activity first.

Once your dog understands it:

1. start with an easy, loose filling
2. introduce slightly softer/stickier fillings
3. gradually increase difficulty
4. Only then consider freezing if your dog enjoys it

Freezing changes the difficulty considerably.

For some dogs, that is enjoyable.

For others, it turns a perfectly good activity into an exercise in frustration.

Puppies may also enjoy a chilled or frozen, appropriately filled Puppy KONG during teething, and KONG itself suggests freezing stuffed Puppy KONGs once the puppy understands the toy.

How full should I stuff a KONG?

There is no prize for filling every millimetre.

I would rather see a dog finish an easy KONG calmly than spend half an hour becoming increasingly annoyed by a difficult one.

For beginners:

loose and easy

For experienced dogs:

gradually more challenging

For a dog who becomes frustrated:

make it easier again

You can even put a little food around the outside or opening when first introducing the toy.

Success teaches the dog how the activity works.

How long should a dog use a KONG?

There is no correct number of minutes.

It depends on:

• the filling
• the dog
• their experience
• the size
• whether it is frozen
• their chewing style
• how hungry they are

I would not judge enrichment by duration alone.

Ten relaxed minutes can be more useful than forty frustrated ones.

Watch the dog rather than the clock.

Can I leave my dog alone with a KONG?

Do not assume that because KONG rubber is durable, every KONG is automatically safe for every dog without supervision.

KONG’s own product warnings say to supervise use and discontinue use if the toy becomes damaged.

With any new toy, supervise your dog until you understand how they interact with it.

Some dogs lick and gently chew.

Some try to dismantle everything they meet.

That difference matters.

How do I clean a KONG?

Food toys should be cleaned properly after use.

KONG’s current cleaning instructions say to:

1. rinse with warm water and washing-up liquid
2. soak stubborn dried food if necessary
3. scrub inside
4. rinse thoroughly
5. use the top rack of the dishwasher for KONG rubber toys if preferred
6. skip the dishwasher drying cycle, because excessive heat can damage the toy

KONG’s official cleaning instructions provide the full method.

For the wider subject, read my How to Clean Dog Toys Safely guide

. That guide covers KONGs, lick mats, snuffle mats, soft toys and balls, including when cleaning is no longer enough and the toy should be replaced.

When should I replace a KONG?

Inspect it frequently.

Replace it if you find significant:

• cracks
• splits
• missing rubber
• weakened sections
• pieces being removed
• damage that changes its size or integrity

KONG’s own guidance says to discontinue use when damaged.

Cleaning makes a dirty KONG clean.

It does not make a damaged KONG safe.

Is a KONG indestructible?

No.

And importantly, KONG does not claim that every toy is indestructible.

Different products are designed for different uses. For example, KONG says its Classic is suitable for chewing, fetching and slow feeding, while products such as Wubba, Wobbler and Cozie have different intended uses and should not simply be treated as chew toys.

Choose a product for what your dog is actually going to do with it.

That principle applies to every dog toy, not just KONG.

Can a KONG help a dog settle?

Sometimes.

Licking, chewing and working for food can be a useful quiet activity for some dogs.

But I would avoid saying a KONG automatically “calms” every dog.

A dog may:

• settle afterwards
• become excited when they see it
• become frustrated by difficult filling
• guard it
• try to destroy it
• ignore it completely

The dog’s response tells you whether it is useful enrichment for that dog.

My “My Dog Enrichment Ideas That Actually Help Calm and Tire Your Dog” guide looks at enrichment much more broadly than just food toys.

KONGs and resource guarding

If your dog growls, freezes, becomes tense, hovers over the KONG or behaves defensively when somebody approaches, do not repeatedly take it away to “teach them who’s boss”.

Do not deliberately provoke guarding.

Give the dog space and manage the situation safely.

If resource guarding is persistent or creates a safety concern, seek appropriately qualified, reward-based behavioural help.

A food toy is not worth creating conflict over.

KONGs for nervous and rescue dogs

For nervous dogs, I keep the introduction low pressure.

That may mean:

• placing the KONG somewhere familiar
• using familiar food
• keeping the filling easy
• moving away rather than hovering
• allowing the dog to investigate in their own time
• not insisting that they use it

A dog who walks away has given you useful information.

You don’t need to keep pushing the toy towards them.

This same principle runs through my wider Dog Enrichment Ideas and rescue-dog content.

KONGs for dogs on restricted exercise

A food toy can sometimes be useful when a dog’s normal activity has been reduced, but check with your vet after surgery or injury.

Using a KONG still involves movement.

A dog may brace, twist, paw at it, push it around the floor or repeatedly change position.

If your vet has restricted movement, ask what activities are suitable rather than assuming anything labelled “mental stimulation” is automatically safe.

KONGs are useful, but they are not the whole of enrichment

I like KONGs.

I use and recommend them because they are reusable, adaptable and relatively straightforward.

But your dog does not need every KONG product.

And they certainly don’t need a cupboard full of enrichment equipment.

Enrichment also includes:

• sniffing
• exploring
• searching
• play
• training
• appropriate chewing
• making choices
• social interaction
• quiet observation
• rest

My Dog Enrichment Toys and Tools I Recommend guide compares KONGs with lick mats, snuffle mats, beginner puzzles and other practical enrichment equipment.

And if you would rather start without buying anything, my DIY enrichment guides contain plenty of inexpensive ideas.

Which KONG should I buy? Quick summary

If you’re still deciding, I would use this as the starting point:

Young puppy: appropriately sized Puppy KONG.

Average healthy adult chewer: appropriately sized red KONG Classic.

Powerful chewer: appropriately sized black KONG Extreme, considering KONG’s advice to size up for determined chewers.

Older dog: consider Senior if the softer rubber is appropriate, but take into account dental health and any veterinary advice.

Between sizes: size up.

Unsure about your dog’s chewing strength: supervise closely and reassess.

Dog destroys pieces of the toy: stop using it.

The most expensive or toughest KONG is not automatically the right KONG.

The right one is the appropriate size and rubber type for the dog.

Frequently asked questions

What size KONG does my dog need?

Use KONG’s weight guide as a starting point, then consider your dog’s mouth size and chewing style. KONG advises sizing up if you are unsure and says power chewers may need to go up one or two sizes.

What colour KONG should my dog have?

Puppy KONGs are pink or blue, Classic is red, Extreme is black and Senior is purple. The colours identify different rubber formulations intended for different ages and chewing styles.

What is the black KONG for?

The black KONG Extreme uses KONG’s toughest rubber formula and is intended for powerful chewers.

What is the difference between red and black KONGs?

Red Classic is intended for average adult chewers. Black Extreme uses a tougher rubber formulation for more determined chewers.

Is a KONG safe for a puppy?

An appropriately sized Puppy KONG is specifically designed for puppies. Supervise its use, inspect it for damage, and move it to the appropriate adult range as your puppy matures.

At what age should I stop using a Puppy KONG?

KONG currently states that its Puppy rubber toys are not recommended for puppies over 9 months. Your dog’s individual development and chewing behaviour still matter.

Can I freeze a KONG?

Yes, if the filling is suitable. Introduce the toy easily at first and increase the difficulty gradually, rather than starting with a tightly packed frozen KONG.

Can KONGs go in the dishwasher?

KONG says its rubber toys are top-rack dishwasher safe but advises skipping the drying cycle because excessive heat can damage them.

Are KONGs indestructible?

No. Inspect toys frequently and remove them when damaged.

Can I put my dog’s normal food in a KONG?

Yes, depending on the type of food and your dog’s dietary needs. Using part of the normal daily food allowance can be a simple way of providing food enrichment without continually adding extra treats.

More dog enrichment guides

If you found this useful, continue with:

Dog Enrichment Ideas That Actually Help Calm and Tire Your Dog

Ditch the Bowl at Mealtimes

Dog Enrichment Safety: When a Brain Game Becomes Frustrating

How to Clean Dog Toys Safely

DIY Dog Toys for Enrichment

How to choose safe toys and when to replace them

You can compare my wider selection through Dog Enrichment Toys and Tools I Recommend and Dog and Pet Products I Recommend.

If your dog would benefit from calm, individual enrichment support at home, learn about my Canine Enrichment Visits in Finchley.

This guide provides general dog-care information and is not a substitute for veterinary or qualified behavioural advice. Speak to your vet if you are concerned about your dog’s teeth, mouth, diet, health or ability to use a food toy safely. Contact your vet promptly if your dog swallows part of a toy or becomes unwell.